ABB 1MRK002122-ABR00 Communication Module: Keeping Protection Relays Connected, Reliably

Introduction

A protection relay is only as valuable as its communication. It can measure fault current perfectly, but if its status, alarms, and trip signals cannot reach the control center — or if its settings cannot be updated remotely — the protection system is flying blind. The ABB 1MRK002122-ABR00 is an ABB communication/interface module from the 1MRK002122 order-code family, which serves the ABB Relion line of protection and control IEDs (intelligent electronic devices). It is the link that keeps a numerical protection relay talking to the rest of the substation: to other relays, to station computers, to SCADA, and to the engineering workstation. This article examines what the module does, why its design matters, and where it earns its keep.

What it does

Within a Relion protection installation, the 1MRK002122-ABR00 provides the communication interface for the protection device — carrying the data that makes modern substation automation possible: measured values, status indications, event records, disturbance reports, and setting updates. Communication modules of this family support the protocols that utilities actually use — IEC 61850 for substation automation, DNP3 for SCADA integration, and IEC 60870-5-103 for legacy protection communication — and provide the physical links, including fiber-optic connections, that connect the relay to the station network. The “-ABR00” suffix designates the specific hardware variant, one of several (ABR01, ABR02, ABR03 and others) in the same order-code family, so the module can be matched to the exact IED and communication scheme in service.

Product advantages

The first advantage is reliability engineered for protection duty. Communication in a protection system is not best-effort office networking; it carries life-safety and asset-protection data that must arrive quickly and correctly in a fault. This module is built to ABB’s protection-product standards, designed for continuous service in substation environments and for the deterministic behavior that protection applications demand.

The second advantage is high-speed, redundant connectivity. The family is offered with high-speed and redundant communication links, including multimode fiber-optic interfaces. Redundancy matters because a protection scheme should not have a single point of failure in its signaling path: if one link or path is lost, the protection device remains visible and controllable from the station level. Fiber-optic links additionally provide galvanic isolation and complete immunity to the electromagnetic interference that is unavoidable in switchyards, while supporting the longer distances between relay panels and control rooms.

The third advantage is protocol versatility. Supporting IEC 61850, DNP3, and IEC 60870-5-103 in one module family means the same hardware can serve modern digital substations, brownfield SCADA integrations, and legacy protection schemes. This flexibility is especially valuable in retrofit work, where a new or replacement module must join an existing substation architecture without a wholesale communication redesign.

The fourth advantage is seamless integration with the Relion platform. Designed for ABB’s Relion protection and control IEDs, the module matches the electrical, mechanical, and configuration characteristics of the relay it serves. Configuration and commissioning are handled through the same ABB protection engineering tools as the rest of the IED, which shortens engineering time and reduces the risk of integration errors.

The fifth advantage is its role as a dependable spare. The 1MRK002122 family has a large installed base across utility and industrial protection schemes. For an operator, stocking the correct -ABR variant is a small investment that converts an unplanned communication failure — which can disable visibility of a feeder, transformer, or line bay — into a short, planned replacement.

The sixth advantage is ABB’s track record in protection technology. The 1MRK prefix is ABB’s long-established designation for its protection and control product line, and the module benefits from the same design, testing, and quality assurance culture as the relays it serves.

Application scenarios

The 1MRK002122-ABR00 finds its natural home in substation protection and control. In a transmission or distribution substation, it connects feeder, transformer, and line protection IEDs to the station bus and the SCADA master, so operators see breaker status, alarms, and measurements in real time and can retrieve disturbance records after a fault. In transformer and line differential schemes — such as those built around the Relion 670 series — the communication module carries the high-speed peer-to-peer data that makes differential protection work across the protected zone. In industrial power systems, it links protection relays in plant substations, mining installations, and data centers to the facility’s control and monitoring systems. In distributed generation and renewable plants, it brings inverter-coupled generation and its protection into the grid operator’s visibility. And in the repair and maintenance world, it is frequently sourced as a direct replacement module for an aging or failed communication interface in an existing Relion installation, where matching the order code and variant keeps the panel change simple and the protection scheme out of service for the shortest possible time.

Sourcing note

Because the 1MRK002122 family includes several -ABR variants with different hardware and interface configurations, buyers must confirm the exact suffix against the nameplate of the module being replaced, and verify the communication interfaces (fiber type, protocol options) required by the installation.

Conclusion

The ABB 1MRK002122-ABR00 is a quiet but essential component of modern protection systems: the communication interface that keeps Relion relays visible, controllable, and coordinated. With protection-grade reliability, redundant high-speed links, multi-protocol support, and a mature spare market, it is a component that utilities and industrial operators can depend on — and one worth planning for before the failure, not after.

If you need ABB 1MRK002122-ABR00, you can send us the complete model number, nameplate, or product photograph. Our team can assist with model verification, quotation, availability checking, and procurement support.